Honeywell T8501 Manual de usuario

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

69-0925-4

T8501

Microelectronic Thermostats

APPLICATION

The T8501 Microelectronic Thermostats provides electronic control of 24 Vac single-stage heating and cooling

systems. Refer to Table 1 for a general description of the thermostat. All T8501 thermostats require a common wire to

supply power.

MERCURY NOTICE

If this control is replacing a control that contains

mercury in a sealed tube, do not place your old

control in the trash. Dispose of properly.

Contact your local waste management authority

for instructions regarding recycling and the

proper disposal of the old control.

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow

the instructions can damage the product or cause

a hazardous condition.

2. Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

3. Installer must be a trained, experienced service

technician.

4. After completing installation, use these instructions

to check out the product operation.

Location

Install the thermostat about 1.5m (5 ft) above the floor in

an area with good air circulation at average temperature.

See Fig. 1.

Do not install the thermostat where it can be affected by:

— drafts, or dead spots behind doors and in corners.

— hot or cold air from ducts.

— radiant heat from sun or appliances.

— concealed pipes and chimneys.

— unheated (uncooled) areas such as an outside wall

behind the thermostat.

Wallplate Installation

The thermostat can be mounted horizontally on the wall

or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.

Position wallplate horizontally on the wall or on a

2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.

1. Position and level the wallplate (for appearance

only). The thermostat will function properly even

when not level.

2. Use a pencil to mark the mounting holes.

See Fig. 2.

3. Remove the wallplate from the wall and drill two

3/16 inch (76 mm) holes in the wall (if drywall) as

marked. For firmer material such as plaster, drill

two 7/32 inch (5.56 mm) holes. Gently tap anchors

(provided) into the drilled holes until flush with the

wall.

4. Position the wallplate over the holes, pulling wires

through the wiring opening.

5. Loosely insert the mounting screws into the holes.

6. Tighten mounting screws.

Table 1. Description of T8501 Thermostats.

System Changeover System Selection

Fan

Selection Comments

Heat-Cool Automatic Heat-Off-Cool-Auto On-Auto System and fan selections are done by

keyboard.

T8501 MICROELECTRONIC THERMOSTATS

69-0925—4 2

Fig. 1. Typical location of thermostat.

Fig. 2. Mounting the wallplate.

WIRING

All wiring must comply with local electrical codes and

ordinances. Refer to Fig. 3 and 5 for typical hookup. A

letter code is located near each terminal for identification.

CAUTION

Electrical Shock Hazard.

Can cause electrical shock and equipment

damage.

Disconnect power before wiring.

1. Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 6.

IMPORTANT

Use 18 gauge, color-coded thermostat cable for

proper wiring.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole.

4. Plug the hole with nonflammable insulation to pre-

vent drafts from affecting the thermostat.

Fig. 3. Typical hookup in heat only application.

5 FEET

[1.5 METERS]

YES NO

M10106

WIRES

THROUGH WALL

WALL

MOUNTING

HOLES

MOUNTING

SCREWS

M6530A

WALL

ANCHORS

(2)

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

HEATING

RELAY OR

VALVE COIL

M4822

C W

OUTDOOR

TEMPERATURE

SENSOR

THERMOSTAT

T8501 MICROELECTRONIC THERMOSTATS

3 69-0925—4

Fig. 4. Typical hookup in heat and cool system with

one transformer.

Fig. 5. Typical hookup in heat and cool system with

two transformers.

Fig. 6. Correct wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and wall-

plate. See Fig. 7.

2. Press lower edge of case to close and latch.

NOTE: To remove the thermostat from the wall, first pull

out at the bottom of the thermostat; remove top

last.

Fig. 7. Mounting thermostat on wallplate.

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

HEATING

RELAY OR

VALVE COIL

M4821

COMPRESSOR

CONTACTOR

FAN

RELAY

CBOGYW

OUTDOOR

TEMPERATURE

SENSOR

COOL

CHANGEOVER

VALVE OR

DAMPER

HEAT

CHANGEOVER

VALVE OR

DAMPER

THERMOSTAT

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

JUMPER Rh TORc IN ASINGLE TRANSFORMER SYSTEM.

HEATING

RELAY OR

VALVE COIL

M4820

COMPRESSOR

CONTACTOR

FAN

RELAY

RhOTOTOGYCBW

OUTDOOR

TEMPERATURE

SENSOR

COOL

CHANGEOVER

VALVE OR

DAMPER

HEAT

CHANGEOVER

VALVE OR

DAMPER

THERMOSTAT

(HOT)

M4826

FOR WRAPAROUND

INSERTION STRIP

7/16 IN. (11 MM).

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM).

M6798

PRESS LOWER EDGE OF CASE TOLATCH.

ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

T8501 MICROELECTRONIC THERMOSTATS

69-0925—4 4

Using Thermostat Keys

The thermostat keys are used to:

• set the temperature,

• display present setting,

• configure Installer Setup,

• check System-Test,

• display outdoor temperature (select models),

Select models have keys to:

• set the system operation,

• set the fan operation.

NOTE: Always press the keys with your fingertip or sim-

ilar blunt tool. Sharp instruments like a pen or

pencil point can damage the keyboard.

See Fig. 8 for key locations.

Fig. 8. Thermostat key locations and descriptions.

SETTINGS

System and Fan Settings

System settings control the thermostat operation:

Heat: The thermostat controls the heating.

Off: Both the heating and cooling are off.

Cool: The thermostat controls the cooling.

Auto: The thermostat automatically changes between

heating and cooling operation, depending on the

indoor temperature.

Fan settings control the system fan:

On: Fan operates continuously.

Auto: Fan operates with equipment.

The system default setting is Heat and the fan default

setting is Auto. Use the keyboard or System and Fan

switches, depending on model, to change to the desired

settings. See Fig. 9.

Fig. 9. T8501 System and Fan key locations.

Temperature Settings

The default setpoint for heat is 70°F (21°C) and for cool

is 78°F (25.5°C). Press the increase ! or decrease #

key to change the present setting. To change between

heat and cool, press the Information ikey until the setting

to be changed appears.

INSTALLER SETUP

NOTE: For most applications, the thermostat factory-

settings do not need to be changed. Review the

factory settings in Table 2 and if no changes are

necessary, go to the Installer Self-Test section.

The Installer Setup is used to customize the thermostat

to specific systems. Some of the options include:

— temperature display,

— changeover and

— outdoor temperature display.

Installer Setup numbers are listed in Table 3. The table

includes all the configuration options and the factory-

settings for the T8501.

A combination of key presses are required to use the

Installer Setup feature:

— To enter the Installer Setup, press and hold the

information ikey with the increase !and decrease #

keys until the first number is displayed. All display

segments appear for approximately three seconds

before the number is displayed. See Fig. 11 and 12.

— To advance to the next Installer Setup, press the

ikey.

— To change a setting, use the increase !or

decrease # key.

— To exit the Installer Setup, press and hold the

Information ikey until the display returns to normal

(approximately three seconds). The display scrolls the

numbers backward to get to the normal display. The

Installer Setup is automatically exited if no key

presses are made for five minutes.

NOTE: Only configurable number are shown.

M6801A

DISPLAY PRESENT

SETTINGS AND SCROLL

THROUGH INSTALLER

SETUP (INFORMATION KEY)

iDECREASE

TEMPERATURE

SETTING

INCREASE

TEMPERATURE

SETTING

M10147C

Press to select

heating or cooling

equipment.

Em. Ht.

-Emergency heating

HeatÑ Heating equipment

Off Ñ No equipment

CoolÑCooling equipment

AutoÑ Thermostat

automatically selects

heating and cooling

equipment.

Press to select

heating or cooling

equipment.

OnÑ Fan runs continuously

AutoÑ Fan runs when

heating or cooling

equipment operates

System

Fan

LED INDICATOR.

T8501 MICROELECTRONIC THERMOSTATS

5 69-0925—4

Fig. 10. Display of all LCD segments.

Fig. 11. Display of Installer Setup

number and setting.

CAUTION

Equipment Damage Hazard.

Heat pump and electric heat systems can be

damaged when run without fan.

Configure to 01 in Installer Setup number 02 to

prevent equipment damage.

IMPORTANT

Only configurable numbers are shown on the

device. Example: If thermostat does not have a

system key, Installer Setup Number 12 does not

display. Review Table 3 factory-settings and

mark any desired changes in the Actual Setting

column. When Installer Setup is complete,

review the settings to confirm that they match

the system.

Em HeatOffCool Auto Only

Heat Cool

OnAuto

System Fan

Room

Outdoor

Em Ht Temporary Setting

Wait

%Humid

Aux Ht Remote

Repl

Batt

M4844

M10105B

INSTALLER SETUP

NUMBER DISPLAY

(COLUMN 1 OF TABLE 2)

FACTORY SETTING OR

OTHER CHOICE DISPLAY

(COLUMN 3 OR 5 OF TABLE 2)

Table 2. Thermostat Installer Setup Options.

Select

Installer Setup

Number (Press

i key to

change)

Factory Setting

Other Choices

(Press !or #key to change)

Display Description Display Description

Not Used. 01 — — — —

Fan

operationa

02 0 Conventional

applications where

equipment controls

fan operation in heat

mode.

01 Heat pump or electric heat

applications where thermostat

controls fan operation in heat

mode.

Not Used. 03 — — — —

Heating cycle

rate.

04 6 6 cph used for

conventional

systems

01, 03

or 09

01—1 cph used for radiant floor

heat, gravity system

03—3 cph used for hot water

systems or high efficiency

furnaces

09—9 cph used for electric heat

systems

Not Used. 05 thru 11 — — — —

Changeover

(T8501D

only)

12 01 Manual changeover 00 00—Auto changeover

Not used 13 — — — —

T8501 MICROELECTRONIC THERMOSTATS

69-0925—4 6

IMPORTANT

Review the settings to confirm that they match

the system. Press Run Program to exit the

Installer Setup. The thermostat has saved the

Installer Setup changes and initiated a reset in

order to operate using the new settings. Be sure

to set the current day and time immediately.

Degree

temperature

display

14 00 Temperature is

displayed in °F

01 Temperature is displayed in °C

Not Used. 15 thru 18 — — — —

Extended fan

operation in

heating.a,b

19 00 No extended fan

operation after the

call for heat ends.

01 Fan operation is extended 90

seconds after the call for heat

ends.

Extended fan

operation in

cooling.a

20 00 No extended fan

operation after the

call for cool ends.

01 Fan operation is extended 90

seconds after the call for cool

ends.

Not Used. 21 thru 23 — — — —

Outdoor

temperature

displaya

24 00 No outdoor

temperature is

displayed.

01 Outdoor temperature is

displayed. Needs a C7089B1000

Outdoor Temperature Sensor to

operate.

Not Used. 25 thru 32 — — — —

Minimum off

time for the

compressor.

33 05 5 minutes minimum

off time for the

compressor.

00, 01,

02, 03

or 04

Minimum number of minutes (0

thru 5) the compressor will be off

between calls for the compressor.

Temperature

range stops

in heating.

34 90 Heating setpoint can

be set no higher

than 90°F.

40 to 90 Number can be set anywhere

between 40 and 90 in 1°F

increments.

Temperature

range stops

in cooling.

35 45cLowest setpoint

cooling can be set

to.

45 to 99 Number can be set anywhere

between 45 and 99 in 1°F

increments.

System On

display.a

36 00 LCD On symbol is

displayed when

system is energized.

01 Display is disabled, usually set

for 01 for a zoned system.

Temperature

display

adjustment.

37 00 No difference in

displayed

temperature and

actual room

temperature.

+3 thru

01—Display adjusts to 1°F higher

than actual room temperature.

02—Display adjusts to 2°F higher

than actual room temperature.

03—Display adjusts to 3°F higher

than actual room temperature.

-1—Display adjusts to 1°F lower

than actual room temperature.

-2—Display adjusts to 2°F lower

than actual room temperature.

-3—Display adjusts to 3°F lower

than actual room temperature.

aAvailable on select models.

bMode 02 must be set to 01 to extend fan operation.

Table 2. Thermostat Installer Setup Options. (Continued)

Select

Installer Setup

Number (Press

i key to

change)

Factory Setting

Other Choices

(Press !or #key to change)

Display Description Display Description

T8501 MICROELECTRONIC THERMOSTATS

7 69-0925—4

INSTALLER SYSTEM TEST

Use the Installer System Test to check the thermostat

operation. Refer to Table 3 for a list of the available

system tests.

CAUTION

Equipment Damage Hazard.

Minimum off time for compressor is bypassed

during Installer System Test.

Prevent compressor from cycling too quickly.

To start the system test:

Press and hold the increase !and decrease #keys at

the same time until two zeros (00) appear. All segments

of the LCD are displayed before 00 appears.

See Fig. 11 and 12.

Fig. 12. Display of all LCD segments.

Fig. 13. Display of test number.

Refer to Table 4 for the directions and results of the

specific tests.

IMPORTANT

Models with System and Fan switches must set

the switches to the equipment that is being

checked for the equipment to operate.

NOTE: Press and hold the increase !and decrease #

keys for three seconds to exit the system test

mode. The system test times out after five min-

utes without any key presses.

Table 3. Tests Available In Installer System Test.

Test

Number System Test Description

10-19 Heating equipment can be turned on and

off.

30-39 Cooling equipment can be turned on and

off.

40-49 Fan equipment can be turned on and off.

60 0 to

60 19

Keyboard keys test.

70-79 Thermostat information including date

code and software versions are displayed.

Em HeatOffCool Auto Only

Heat Cool

OnAuto

System Fan

Room

Outdoor

Em Ht Temporary Setting

Wait

%Humid

Aux Ht Remote

Repl

Batt

M4844

M6792A

TEST NUMBER

Table 4. Installer System-Test Options.

Keys to

Press

Test

Number Description

Heating Equipment System-Test

i10 Enter heating equipment system-test. (Set System switch to Heat on switch models.)

!11 Heat comes on. When Installer Setup number 02 is 01, the system fan is also energized.

#10 Heat and system fan turn off.

Cooling Equipment System Test

i30 Change from heating to cooling equipment system test. (Set system switch to Cool on

switch models.)

!31 Cool and system fan come on.

#30 Cool and system fan turn off.

Fan Equipment System Test (T8501D only)

i40 Change from cooling to fan equipment system-test.

!41 Fan comes on.

#40 Fan turns off.

T8501 MICROELECTRONIC THERMOSTATS

69-0925—4 8

Key or Switch Operation System-Testa

IMPORTANT

Test numbers are displayed only when the system is configured for the selected function.

Example: Numbers 60, 61 and 62 are the only numbers that are displayed when a system is configured for

heat only.

System Key or Switch System Test (When System switch is used, move switch to see Test Numbers.)

i60 Change from cooling or fan to key operation system test.

System 61 Heat test number is displayed. (Set System switch to Heat.)

System 62 Off test number is displayed. (Set System switch to Off)

System 63 Cool test number is displayed. (Set System switch to Cool.)

System 64 Auto Test number is displayed.

Fan Key System Test (Fan switch cannot be tested)

Fan 68

Fan 69

aAvailable on select models.

Table 4. Installer System-Test Options. (Continued)

Keys to

Press

Test

Number Description

T8501 MICROELECTRONIC THERMOSTATS

9 69-0925—4

THERMOSTAT INFORMATION

1. Press the ikey to access the thermostat informa-

tion.

2. Press the increase !key to display the production

date code. The first two large digits are the month

and the third digit is the last digit of the year (Exam-

ple: 026 = February 1996).

3. Press the increase !key again to display the soft-

ware identification code. (Example: 02 = software

ID code 2).

4. Press the increase !key again to display the soft-

ware revision number (Example: 001 = revision

number 1).

5. Press the increase !key again to display the

EEPROM identification code. (Example: 222 =

EEPROM ID 222.)

6. Press and hold the increase !and decrease #

keys together, until the room temperature is dis-

played, to exit the system test mode. The system

test times out after five minutes without any key

presses.

CHECKOUT

Outdoor Temperature Sensor

(Select Models)

Allow the outdoor temperature sensor to take in the

outdoor air for a minimum of five minutes before taking a

reading. With an accurate thermometer ±1°F (±0.5°C),

measure the temperature at the sensor location, allowing

time for the thermometer to stabilize before reading.

Match the thermometer reading to the outdoor

temperature display at the thermostat.

M4864

M4865

M4866

M6791

M4867

T8501 MICROELECTRONIC THERMOSTATS

69-0925—4 10

TROUBLESHOOTING GUIDE

Table 5. Troubleshooting Guide.

Symptom Possible Cause Action

Display will not

come on.

Thermostat is not being

powered.l

•Check that C terminal is connected to the system

transformer.

•Check for 24 Vac between C and R or RH terminals.

— If missing 24 Vac:

— check if the circuit breaker is tripped—reset the circuit

breaker.

— check if the system fuse is blown—replace the fuse.

— check if the power switch on the HVAC equipment is in

the Off position—set to the On position.

— check wiring between thermostat and HVAC

equipment—replace any broken wires and tighten any

loose connections.

— If 24 Vac is present, proceed with troubleshooting.

Thermostat microprocessor is

locked up.

Remove the thermostat from the wallplate for two minutes. After

two minutes, replace the thermostat on the wallplate.

Temperature

display is incorrect.

Room temperature display has

been reconfigured.

Enter Installer Setup number 37 and reconfigure the display.

Thermostat is configured for °F

or °C display.

Enter Installer Setup number 14 and reconfigure the display.

Bad thermostat location. Relocate the thermostat.

Temperature

settings will not

change. (Example:

Cannot set the

heating higher or

the cooling lower.)

The upper or lower temperature

limits were reached.

Check the temperature setpoints:

• Heating limits are 40 to 90°F (4.5 to 32°C)

• Cooling limits are 45 to 99°F (7 to 37°C).

The setpoint temperature range

stops were configured.

Check Installer Setup numbers 34 and 35 and reconfigure the

setpoint stops.

Heating will not

come on.

No power to the thermostat. •Check that C terminal is connected to the system

transformer.

•Check for 24 Vac between C and R or RH terminals.

— If missing 24 Vac:

— check if the circuit breaker is tripped—reset the circuit

breaker.

— check if the system fuse is blown—replace the fuse.

— check if the System switch on the HVAC equipment is

in the Off position—set to the On position.

— check wiring between thermostat and HVAC

equipment—replace any broken wires and tighten any

loose connections.

— If 24 Vac is present, proceed with troubleshooting.

Thermostat minimum off time is

activated.

Wait up to five minutes for the system to respond.

System selection is not set to

Heat.

Set system selection to Heat.

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